Scraper blade



Nov. 6, 1951 G. G. MCNAMARA, JR

SCRAPER BLADE Filed Aug. 17, 1946 Patented Nov. 6, 1951 SCRAPER BLADE Gordon G. McNamara, Jr.,.Chicago, Ill.,I assgnoi to International Harvester Company, a corpo`` 1 ration of New Jersey A Application August i7, 1946, serial' o. 691,20'3` tThis invention relates to an improved construction in earth moving implements, and more particularly to an earth-working implement of the grading or bulldozer type. y

-More specifically, it relates to a bulldozertype of implement having an improved construction for controlling theground-working depth of the scraper blade. A prime object of this invention is to provide a scraper for a grader type of implement, said scraper having an adjustable cutting and gauge blade connected thereto.

Y Another object is to y provide an improved scraper having a cutting blade connected to the lower portion thereof for regulating and adjusting the ground working depth of said scraper.

Another object is to provide a cutting and gauge blade hingedly connected to a grading scraper, said blade having cutting portions extending longitudinally forwardly and rearwardly7 underneath the scraper.

A still further object is .to provide a gradertype of scraper blade adapted to be transversely mounted on the forward end of a tractor, said scraper `blade including a transversely extending cutting and gauging blade connected to the lower portionY of said scraper and being angularly adjustable from the tractor to vary and gauge the cutting depth of the scraper.

Other objects of the invention will become f hereinafter more fully apparent from anV examination of Vthe following specification when read in conjunction with the drawing wherein:

- Fig. 1 is a side elevational view of a tractor having a grading implement connected thereto; 1 Fig. 2 is a sectional viewtaken along the line 2 2 of Fig. l, showing a portion of the adjusting means for -angularly adjusting` the cutting and gauging blade of a scraper;

Fig. 3 is an enlarged side elevational view showing a scraper blade having a cutting and gauging blade connected thereto; and

Fig. 4 is a detail sectional view taken along the line 4-,4 of Fig. 3.

As shown in Fig. 1, a tractor is generally indicated by the reference character I0. The tractory I8 includes a longitudinal body structure II which is mounted on a rear axle vstructure I2 carried onl rearground wheels` I3. The forward portion of the longitudinal body is carried on frontV ground wheels I4. An operators station I5 is located at the rear of the longitudinal body II and includes a steering wheel I6 of conventional construction for controlling the front ground wheels I4.

4` claims. (C1. 'sr- 143)l =A ground working implement general-ly desig=l nated by the reference character I1 is supported on the longitudinal Ybody II of the tractor I 0. The ground working implement I1 includes a pair of longitudinally extending channel members I 8, only one of which is shown. A lifting yoke ,20 is pivotally connected to each of the longitudinally extending members I8 by means of a pinZI. A support 22 is rigidly connected at each side of the tractor by means of a brace Z3 securely mounted on the longitudinal body I I. A linkV 24 substantially, parallel to each channel member I8, is pivotallyrconnected at each of its ends to the support 22Vand to the lifting yoke 20. A cylinder and piston construction 25 is connected at each side of the tractor to each longitudinally extending channel I8. A piston rod 25 is connected to each of the lifting yokes 20. A touch control mechanism, comprising a quadrant26, is mounted near the operators station I5 and is adapted to control, in a conventional manner, the lifting movement of the cylinder and piston structure 25.

A grader or dozer blade, generally indicated by the reference character 21, is mounted on the frame I8 at the forward portionrthereof. The blade 21 is transversely carriedV on the channel members I8 by means of two orl more angle brackets 28 which are securely fastened to a transversely extending and vertically concave blade 29. A gusset plate 30 is suitably connected to each of the two angle brackets 28 and the channel members I3. A supporting arm 3| is connected at the upper portion of two of the angle brackets 28 and extends rearwardly thereof for connection between the upstanding arms of a U-shaped bracket 32 which is securely connected to each of the channel members I8. A bolt 33 extending through a U-shaped bracket 32 rigidly connects the supporting arms 3I to said brackets 32. VReferring particularly toV Figs. 2 and 3, a gauging and cutting blade is generally designated by the reference character 34. The gauging and cutting blade 34 is pivotally connected to the lower side of the dozer blade 21 by means of hinges 35 and hingepins36. The blade 34 is transversely coextensive with the dozer blade 21 and includes forwardly and rearwardly extending beveled cutting portions 3l and4 38 respectively. The gauging and cuttingblade 34, as shown in Fig. 3, is substantially at and is normally positioned in a horizontal position with respect to the dozer blade 21. An adjusting means for angularly adjusting the position of the blade 34 3 includes a plurality of U-shaped members 39 whichare securely connected to the rearwardly extending beveled cutting portion 38. A plurality of substantially vertically extending links n are each connected to the U-clamps 39, the upper portion of the links 40 being threaded and extending throughV an Vangle bracket 4I. The angle brackets 4l are 'laterally spaced, as best shown in Figure 2, and are rigidly secured to the rear surface of the concave blade 29. The links loosely extend through the angle brackets iii in sliding relation with respect thereto. A n ad.- justing nut 42 is threaded to the links and isV positioned below the angle lbracket 4|. The nut 42 is adapted to engage thebracket 4l, thus limiting the vertical movement of the link 40. A sleeve 43 is threaded to the upper portion of eachof the links [iii and is in turn connected to lifting arms 413, each of which is rigidly connectedto a transverse shaft E5. The transverse shaft 45 is journaledon brackets 45 suitably rigidlyconnected to the dozer blade 2]. A link H is pivotally connected to the upstanding arm 45 at its forward 'portion and is` pivotallyv connected at. its rearward endY to a detent arm 48 suitably mounted on one of the channel members i8 within reach. of the operators station l5. The detent arm 48 is adjustable about a quadrant t9.

During the operation of the ground implement,

the cylinder and piston construction 25 is operable for raising and lowering the scraper blade 21T. :When it is desiredv to place the scraper blade into a ground workingposition, the same is lowered to Vthe ground and the longitudinally extending channel members I8 are free to pivot about the connection I9 since the cylinder and piston structure 25 is -now in a non-operating status. The operator pushes the detent arm i8 forward thus causing the gauging and cutting blade34 zto be placed at an angular position limited by `the previous adjustment of nut 42, whereby 'the forwardly extending bevel cutting portion 31 will point downwardly and be in a position :to penetrate the ground. The `ground. working implement is moved forwardly and the dozer blade =21 penetrates the Vground to the desired fdepth `and the operator may manually adjust the angularity of the cutting blade to effect any desiredpenetration. By the angularity of the Vcutting and gauging blade, the operator may also control the volume ofground that is to bemoved at any one time by the dozer blade 2J.

When Vit is desired to remove the dozer blade 2-'| from its ground penetrating position, the cutting and gauging blade is -angularly adjusted so that its forward cutting edge points slightly upwardly with respect to a horizontal plane. Continued forward movement of the tractor thereuponcauses the dozer blade to leave the ground. It fis readily apparent that simple manual adjustment of the cutting and gauging blade is effective to regulate the depth penetration of the dozer blade andv that this can be readily accomplished-under themanualfcontrol of the operator at his station on the tractor. The inherent difficulties of the conventional type of grader or bulldozer `are thereby eliminated in that the depth of cut can be readily controlled and that excessive stress both upon theV structure of the dozer and the tractor are eliminated. The depth of cut can be quickly adjusted regardless of the type of soil to be worked. Excessive strain on the operator and the tractor are eliminated. Since it is no longer necessary to back up the tractor and remove the blade from the ground,

4 due to excessive penetration beyond the power capacity of the tractor, the operator can simply adjust his cutting blade, thereby permitting the tractor to maintain its forward motion. The cutting and gauging blade 34 is also provided with the rearwardly extending bevel portion 38; said portion permitting depth adjustment when the tractor is propelled rearwardly. This fea-- ture is also especially effective in the digging of ditches or other trenches where forward and rearward digging movement of the dozer blade 21 is necessary. y

vIt is to be understood that modifications in the structure may be made which do not depart from the spirit of the invention, as disclosed, nor

the scope thereof as defined in the appended claims. v

' What is claimed is:

l. An earth moving implement comprising a mobile frame, an earth working element associated with-said frame -in transverse relation with respect tothe direction of movement of said frame, a combined gauging and cutting blade pivotally connectedV to the .lower portion of said earth working element and coextensive therewith, saidl blade normally being positioned ina horizontal Yplane-and having tapered cutting*- edges extending forwardly and rearwardly o'fvsaid earth working elementi,Y and means connected-*to said blade Vfor angularly moving kthe same with respect to said earth working element. v

2. The combination with a tractor having a longitudinal body supported onfrontandVV rear ground wheels, of an earth workingV implement mounted on said tractor, said implement com-` pricing apair of frame members being pivotally connected at opposite sides of `said longitudinal body and extending longitudinally with respect thereto, a substantially vertical scrapery blade rigidly connected to Said frame members in transverse relation with respect tothe direction of travel'of saidtracton agauging andlcutting blade pivotally` connected to thek lower portion of said scraper blade, said gauging .andcutting bladeV having tapered cuttingportions ex@ tending longitudinally forwardly and rearwardly beneath said; scraper blade, andlinkage means-on said tractor connecting saidgauging and cutting blade for angularly adjusting the samewith respect -to said .scraper Eblade, thereby regulating the groundworking depth'of saidv` scraper blade.

"3... An earth moving-implement comprising a mobile frame, an ,earth working element Iasso-- ciated with said frame in transverse relation with respectto .the-direction of movement of said framaa combined/gauging; andvcutting blade pivotallyconnected to the-lower portion of said earthworkingelement, said blade normally. .being positioned in a horizontal plane anr'ihaving` substantiallyy flat guide portions-extending forwardly and rearwardly withrespect tothe pivotal connection of said blade toxthe Vearth `working element, the `pivotal point 1 of'- connection of vsaid blade with respect to said earth workingelement being positionedV substantially beneath the lower edge'ofl said earth working element Awhereby the forwardlguide portion may vbe freelytilted upwardly and-.the rearward guidefportionmayv be simultaneouslyv freelytilted downwardly withlre-` speci; 1-toithenormal horizontal .plane position of said blade, and means connected' to isaid blade for vtiltabl-y Ymoving 'the same with respect to vthe earth working `element thereby regulating the depth ofsaid earth working element.

4. An earth working implement fcOm-prising a 5 mobile frame, an earth working element associated with said frame in transverse relation with respect to the direction of movement of said frame, said earth working element including a dozer blade, a combined gauging and cutting blade pivotally connected to the lower portion of said earth working element, said blade normally being positioned in a horizontal plane and having substantially at guide por-tions extending substantially forwardly and rearwardly of said dozer blade, the pivotal point of connection of said gauging and cutting blade with respect to said earth Working element being positioned immediately adjacent the lower edge of said dozer blade whereby the forward guide portion may be freely tilted upwardly and the rearward guide portion may be simultaneously freely tilted downwardly 6 with respect -to the normal horizontal plane position of said blade, and means connected to said blade for tiltably moving the same with respect to said earth working element, thereby regulating the ground Working depth of said earth working element.

GORDON G. MCNAMARA, JR.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,029,122 Stout, Jr. Jan. 28, 1936 2,146,807 Ferari Feb. 14, 1939 2,303,379 Mork Dec. 1, 1942 

